android - 使用 DataBindingComponent 膨胀方法

Question

我在 Glide 成功渲染图像后更新 TextView 时看到此错误。

Fatal Exception: java.lang.IllegalStateException: Required DataBindingComponent is null in class CustomBinding. A BindingAdapter in CustomViewModel is not static and requires an object to use, retrieved from the DataBindingComponent. If you don't use an inflation method taking a DataBindingComponent, use DataBindingUtil.setDefaultComponent or make all BindingAdapter methods static.

@BindingAdapter(value = { "android:src", "placeHolder" }, requireAll = false) 
public void setUrl(ImageView imageView, String url, Drawable placeHolder) {
          Glide.with(imageView.getContext())
              .load(url)
              .placeholder(placeHolder)
              .centerCrop()
              .listener(new Listener<String, Drawable>() {
                @Override
                public boolean onException() {
                  viewmodel.setTextVisible(true);// ERROR!
                  return false;
                }

                @Override public boolean onResourceReady() {
                  viewmodel.setTextVisible(false); // ERROR!
                  return false;
                }
              })
              .into(imageView);
        }

public void setTextVisible(boolean visibility) {
    textVisibility = visibility;
    notifyPropertyChanged(BR.textVisibility);
}

    @Bindable 
    public boolean getTextVisible() {
      return textVisibility; 
    }

这就是我如何初始化 View 模型并将数据绑定(bind)到 fragment 中:

CustomBinding binding =
        DataBindingUtil.inflate(inflater, R.layout.custom, container, 
false);

    CustomViewModel viewModel = new CustomViewModel(data, context);
    binding.setHandlers(new CustomHandlers(context));
    binding.setData(viewModel);

我找不到在 View 模型中实际实现它的方法。预先感谢您的帮助。

Answer 1

遇到了同样的问题，通过向方法添加 @JvmStatic 注释得到解决，并且它有效。

应该是这样的

@BindingAdapter("app:someAttribute")

@JvmStatic

示例

class TestBindingHelper {

    companion object{

        @BindingAdapter("app:serviceOptions")
        @JvmStatic
        fun setServiceOptions(recyclerView: RecyclerView, listOfData: List<String>?) {
             //do something funny
        }

    }
}